Can't access my website via https

ssl_dhparam /usr/local/etc/nginx/ssl/dhparam.pem;

ssl_ecdh_curve secp384r1;              # 384 bit prime modulus curve efficiently supports ECDHE ssl_ciphers up to a SHA384 hash
ssl_prefer_server_ciphers on;          # the preferred ciphers are listed on the server by "ssl_ciphers"
ssl_protocols TLSv1.2 TLSv1.1 TLSv1;   # protocols, the order is unimportant
ssl_session_cache shared:SSL:10m;                                                                           
ssl_session_timeout 128s;              # how long before the client and server must renegotiate the ssl key
ssl_stapling on;                       # staple the ssl cert to the initial reply returned to the client for speed
ssl_stapling_verify on;

Do I need to turn on the ssl_dhparam line?